Hi, I have some questions about helicopter aerodynamics. I have been searching the web (and this forum) up and down but I could not find the answer. Maybe you can help. I want to calculate the cruise and maximum speeds of a helicopter given the weight, motor power, height (assuming pressure decreases linearly). I also want to calculate the climbing speed given the same data. I found some books about helicopter aerodynamics (Bramwell) but they are much too detailed for me since I am no aeronautics or mechanical engineer. Can you give me some simple formulas or point me to good sites? Thanks in advance.